September 2025 — Blargian/ClickHouse: Delivered Granular Query Failure Profiling feature to significantly enhance observability and debugging capabilities for internal query failures. Added new internal profile events that distinguish between SELECT and INSERT operations and separate user-facing from internal failures, enabling precise monitoring of system-level query execution. Committed as 'add internal versions of Failed*Query profile events' (bd4a670bc325ed26859432eb9dd995b5526995a5). This work lays the groundwork for targeted alerts, faster triage, and reduced MTTR, with clear business value in reliability and performance of the query engine.

June 2025 monthly summary for ClickHouse/ch-go: Focused on memory-optimized protobuf handling via stack allocations to reduce heap usage and GC pressure. Implemented stack-allocated buffers in proto/buffer.go and proto/col_str.go, with a targeted change in col_str to replace heap-allocated []byte with stack allocations where possible. Commit: 1bdde09b8180928ec7a092c9fc2d10d24cebf807.